101 Ch. 7 - Chapter 7 Scatterplots Association and...

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Chapter 7 Scatterplots, Association, and Correlation
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Association Relationships between variables are often what we want to learn from data. Examples Are grades actually higher now than they used to be? Do students learn better with the use of computer technology? Does applying magnets to parts of the body relieve pain?
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Association These questions all ask whether or not there is an association between quantitative variables.
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Scatterplots The best way to start observing the relationship between two quantitative variables. As usual we look at a picture first.
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Scatterplots
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Scatterplots What we look for: Direction Form Strength Outliers
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Scatterplots - Direction Negative - a pattern that runs upper left to lower right. Positive – a pattern that runs lower left to upper right.
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Form Linear – the pattern follows a straight line. Non-linear – the
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This note was uploaded on 03/30/2008 for the course STAT 101 taught by Professor Graham during the Spring '08 term at Iowa State.

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101 Ch. 7 - Chapter 7 Scatterplots Association and...

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